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diff --git a/source/a/bash/bash-5.1-patches/bash51-006 b/source/a/bash/bash-5.1-patches/bash51-006
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+++ b/source/a/bash/bash-5.1-patches/bash51-006
@@ -0,0 +1,48 @@
+ BASH PATCH REPORT
+ =================
+
+Bash-Release: 5.1
+Patch-ID: bash51-006
+
+Bug-Reported-by: oguzismailuysal@gmail.com
+Bug-Reference-ID: <CAH7i3LoY7C+pV_yG2LxwPNtAw3kiRkxmB4KcL1dTsih0u2BdKA@mail.gmail.com>
+Bug-Reference-URL: https://lists.gnu.org/archive/html/bug-bash/2020-12/msg00108.html
+
+Bug-Description:
+
+Make sure child processes forked to run command substitutions are in the
+proper process group.
+
+Patch (apply with `patch -p0'):
+
+*** ../bash-5.1-patched/subst.c 2020-12-16 17:01:32.000000000 -0500
+--- subst.c 2020-12-25 19:20:25.000000000 -0500
+***************
+*** 6413,6416 ****
+--- 6413,6423 ----
+ interactive = 0;
+
++ #if defined (JOB_CONTROL)
++ /* Invariant: in child processes started to run command substitutions,
++ pipeline_pgrp == shell_pgrp. Other parts of the shell assume this. */
++ if (pipeline_pgrp > 0 && pipeline_pgrp != shell_pgrp)
++ shell_pgrp = pipeline_pgrp;
++ #endif
++
+ set_sigint_handler (); /* XXX */
+
+*** ../bash-5.1/patchlevel.h 2020-06-22 14:51:03.000000000 -0400
+--- patchlevel.h 2020-10-01 11:01:28.000000000 -0400
+***************
+*** 26,30 ****
+ looks for to find the patch level (for the sccs version string). */
+
+! #define PATCHLEVEL 5
+
+ #endif /* _PATCHLEVEL_H_ */
+--- 26,30 ----
+ looks for to find the patch level (for the sccs version string). */
+
+! #define PATCHLEVEL 6
+
+ #endif /* _PATCHLEVEL_H_ */